Power hammer



\ l l 1 H116 I 1 3 Sheets-Sheet l I Sept. 21 1926.

Sept. 21 1926. A. E. HORMAN POWER HAMMER Filed March 18, 1924 s Sheets-$heet 2 Patented Sept. 21,1926.

' YES 'aar.

rowan HAMMER.

7 Application filed March 18, 1924. Serial No. 700,127.

This invention relates to a power hammer and means to operate the same.

One object of the invention is to provide an improved means for operating the hammer to control without fatigue to the operator the force and frequency of the blows or stop the hammer in any of its operating positions.

Another object is the provision of a simple but efficient mechanism to shift the hammer either way along the anvil without stopping the hammer, the control for such shifting mechanism heing'preferahly associated with the first mentioned controlling means so that the operator may readily change the force of the blow and the position of the hammer simultaneously or independently at will. r

Another object lies in the provision of reliable automatically operating mechanism to disconnect the shifting means when the hammer reaches either end of the frame so that the hammer cannot overtravel.

Another object is to provide a device of the character referred to which can be operated at a high speed.

Another object is to provide releasable means for the hammer so that thehammer head may be moved back out of the way and the anvil used without it.

In the drawings forming a part of this specification and illustrating one embodi ment of this invention,

Fig. 1 shows, in elevation one side of the machine.

Fig. 2 is an elevation of theother side of the machine. 7

Fig. 3 is a front elevation.

Fig. t is a section taken on the line of Fig. 3. v

. Fig. 5 is a sectionon the line of Fig. i; and I Fig; 6 is a section on theline 66 of Fig. 4 looking in the direction of the arrows.

The machine is provided with a base 1 which carries the frame 2 supporting the movable parts of the machine. Mounted upon one end of the base is anzanvil support 3 to whichi s detaehably secured .an anvil at. Power to operate. the "device is furnished the" constantly rotating power. wheelf 5,.connected by belt'6 to the power wheel 7. "In order to vary the eifectiveconnection be tween the two power wheelsythe idler pulley 9 operating a belt tightener" piroviaea. i ea l r s le itated 1. 1291 9 11 alt-e11 lever 8 provided with an operating arm l0'. Forward or rearward movement of the arm 10 will vary the degree of tightness of the belt allowing more or less slippage, between the belt and the power wheels. A brake controls the transverse movements of the 1 hammer. The hammer head proper 18 is pivotally connected to therouteror free end of supporting arm 19, as indicated at 20. A positioning arm 21' is pivoted to the head at a different point thereon as indicated at 22.

This second mentioned arm' is, as shown formed witha sleeve 23 from which pro ect arms 24 extending along opposite sides of arm 19.

A pin or bolt 25 supported by the arms2t supports a filler block 26 and rollers 27. The rollers engage with the cams 17 carried by the frame 1.6. A spring 28 is mounted in a slot 29 in the supporting arm 19 be- The latter serves as ameans for adjusting the compression of the. spring. The; spring 28 presses the rollers into contact with the cams 17 and owing to the shape offthese' cams the positioning arm 21 which moves with the rollers maintains-the hammer head 18 always in substantially vertical position.

The construction and operating of the hammer supporting structure is described in my Letters Patent of the United States 1,457,168., datedMay 29,11923.

For raising the hammer head, Iprovide crank arms 31 and 32' pivotally supported by the cross bar 14 and supporting at their free ends the cross bar 33. Thiscrossbar' shoe 12 for the'power wheel 7. is carried by V The tween the filler block26and the bolt 30.

passes beneath the arm 19and is detachably secured thereto as by means ofilink' 3 f pivotally connected to. the said arinas shown at 35.. 'I he link S-itis. detachahlyfconnected to arm v19 at 136. 'fByfdisconnectingj tliQlihk 34 at 36,,tl1e' hammenhead. is fries toswing upward andfbackward about the bar 1 lintO an inoperative position so as to: permituse of. theanvil without tliQhammer-"liead18 a d W ther? r rammeli -F rs??? cated at 49.

To provide a connection between the swinging cross bar 33 and the power wheel 7, block 39 has secured thereto, as by bands 38 and 38 springs 4E0 which are respectively connected by pairs of links 41 and 4-2 to the respective collars l?) and r4. mounted on shaft or rod 45. The collars l3 and 44 are adjustably held in position on rod 45 by means of the cooperating nuts 46 and 47. An eccentric pivotal connection 48 is provided between the power wheel 7 and the center of the block .39. 'The rod 45 passes freely through the block 39 and is pivotally connected to the arm 31 as indi- This power transmitting structure just referred to allows for some resiliency or yielding between the power wheel 7 and the hammer so as to absorb in the power transmission shocks due to the blows of the hammer. The adjustable nuts 46, 47 furthermore allow adjustment of the tension of the springs and also of the position of the rod 45. longitudinally relatively to block 39 and consequently the position of the hammer relatively to the anvil.

For operating the arm 10 of the mechanism for controlling the application of power to the hammer head, a longitudinal bar 50, arranged on; one side of the frame, is pivotally support-ed at one end by the operating arm 10 and'between the ends theii'eofis supported by a link 51 substantially parallel. to the arm '10. A corresponding bar 52 on the other side of the machine is pivotally supported by the brake-lever l3 and by the link '53 parallel to the downwardly extend ing arm of the brake lever. These longitudinal bars are connected beyond the anvil end of the frame by the cross connecting rod 54:. All of the pivots of this supporting structure are sufficiently loose to allow free movement of the bars 50 and 52 and their supporting links and arms. A spring 55 attached to the link 51 is adjustably connected with the frame as indicated at; 56. This spring tends to hold the longitudinal bars 50 and 52 in position'to loosen the belt so that the hammer head remains stationary and to apply the brake. A platform or pedal 57 is mounted for vertical oscillation about the rod 54. Forward 01'' rearward movement of the platform or pedal affects tightening or loosening of tie driving belt and at the same time tie releasing or application of the brake. F or facilitating such movement of the platform or pedal, the latter is, as shown, provided atvits front and rear edges with flanges against which the foot of the operator may be caused to bear.

The mechanism for controlling the lateral .movement of the hammer head includes a passing loosely through the guide 61 on the slidably tion such as an arm 66 is joined to the lever A tension spring 67 is secured at its opposite ends to the arm and to the frame. The arm 66 and spring (57 tend'to hold the lever 62 normally in its intermediate position.

Mounted slidably but non-rotatably on the rotatable rod 64 and confined against lat eral movement with respect to frame 16 between the bifurcated parts thereof is a yoke shaped latch member 68. The latch member is provided with inn-er clutch fingers 70 and with outer projections 71. The inner fingers are arranged to engage either the upper or lower section of a constantly moving end less chain 72 rotating on sprocket wheels 73 and 73. Sprocket wheel 73 is secured on shaft 74 driven by the worm gear 75 meshing with the suitable worm 76 securedto the supporting shaft for the constantly driven wheel 5 and rotating with said wheel.

By tilting the pedal or platform 57 about the axis of the longitudinal rod 54, it is possible to tilt lever 62 against the tension of spring 67 and accordingly to engage or disengage either the upper or lower finger 70 with the adjacent section of the endless chain 72. The chain 72 always runs in the same direction and at relatively low speed, so that engagement of the fingers 7O therewith and disengagement of the fingers therefrom can be readily'eifec'ted. W'ith this construction, the hammer may be run at a high speed. there being no high speed parts to be engaged or disengaged. Suitable means, such as cams or stops 77, are provided at the sides of the frame to engage the outer projection 71 of the yoke shaped member to au tomatically disengage said member from the endless chain 72 as the former approaches either side of the frame. Asuitable guide 78 is preferably provided between the chain sections to prevent'undue sagging thereof.

Tn operation, power is supplied to rotate the wheel 5 at substantially. constant speed. The transmlssion of power from the wheel 5 to the power'wheel 7 is controlled by the operator moving the platform 57 in a substantially horizontal, or forward and rearward, direction toward or away from the machine. Forward movement of the platform 57 by the foot of the operator towards theanvil causes the beltto be tightened and power to be applied to reciprocate the hammer head up and down, the brake. 12 being IilOYfid. to inoperative position. Positioning ject-ions 67' witlt the adjacent section of the V constantly moving endless chain 72. As the upper and lower portions or sections of the chain move in opposite directions, they carry the hammer head along the anvil in one direction or the other depending upon which of these chainsections is engaged by the latch projection 67.

By the construction shown the operator has the position and force ofthe hammer under his absolute control at all times. If he should carelessly leave the machine running it is automatically stopped by the functioningof the spring 55. If he should leave the latch 68. in engagement with the chain while operating the hammer or otherwise the latch will be automatically disconnected when the hammer reaches the end: of its range of transverse movement. The operator may safely restpart of his weight on the platform 57 without affecting the operation of the machine as it requires either a horizontal traveling motion or atilting motion of the platform to influence the hammer. This. is an important feature of the invention in that it avoids fatigue on the part of the operator and is of great value when a considerable amount of light work is being done.

lVhile a specific embodiment of this inven tion is shown in the drawings, it is obvious that changes may be made in the same without departing from the spirit of the invention so long as they fall within the scope of the appended claims.

Having thus described my invention, what I claim asnew and desire to secure by Let ters Patentof the United States is:

1. A power hammer comprising a hammer head, a support therefor, means to operate the hammer with a variable force to its blow, and means to shift the hammer head transversely with respect to the support,

said operating and shifting means having a common control means to permit simultaneous transverse positioning of the hammer head and selective regulation of the force of the hammer blow.

2. A power hammer comprising a hammer head, a support therefor, means for operating the hammer head in an up-and-down direction with a variable force to its blow, means for feeding the hammer head laterally with respect to the support, and means in cluding a common operating member to con trol the operatlon of said operating and feeding means to permit the simultaneous transverse: feeding of-the hammer headand selective re ulation. of the force of. the ham mer blow.

3. Ina power hammer, the combination ofan anvil, a hammer head; means to operate the hammer-head with a variable force to its blow, means to shift the operating position of'the hammer head along-the anvil and controlling mechanism for said operating and shifting means including a single operating member arranged to tilt and tomove bodily to permit simultaneous transverse shifting of the hammer head and selective regulation of the force ofthe hammer blow;

l. in a device of the class described, the combination of a hamn'ierhead, an anvil, means to operate the hammer head with a variable force toi'its blow, means to shift the operative position thereof along the anvil, and control means common to both said means comprising. a single bodily shiftable and independently tiltable pedal to per.-

init simultaneous transverse positioning of the hammer head and selective of the force of the hammer 'blow.

5. The combination of atool, and means to shift the operating position of the tool regulation comprising an elongated flexible endless member constantly moving longitudinally thereof and means connected with the tool anct arranged to engage the endless member.

6. The combination of a tool, means to shift the operating position of the tool comprising aflexible endless member constantly moving longitudinally thereof, means connectedwith the tool and arranged to engagethe member, means tending to hold the engaging means in neutral position, and means fOl'dliOVlIlg' the engaging means to operative position. I

7. The combination of' a tool, means to shift the tool laterally comprising a constantly moving endless flexible member having sections moving simultaneously in opposite directions, and means connected with the tool and arranged to be connected with either of the two oppositely moving sections of the member to shift the tool in either direction. I

8. The combination of a tool, means to shift the position of the tool comprisingan endless chain and pivoted latch "members connected with the tool and arranged to en.

gage either oftwo oppositely moving chain sections. V

9. The combination of a tool, means to shift the position of the tool comprising an endless chain, a transverse shaft, a latch slidably but non-rotatably mounted on the.

shaft, and means to rotate the shaft whereby to engage or disengage the latch and the chain.

10. The combination of a tool, means to shift theposition of the tool comprising an endless chain, a transverse shaft, a latch I a tiltable controlling member.

slidably but non-rotatably mounted on the shaft, and means to rotate the shaft whereby to engage or disengage the latch and the chain said last mentioned means comprising 11. The combination of hammering means, a supporting frame therefor, means on the frame to support and guide the hammering means for transverse movement, shift the hammering means along the transverse members, and automatic means to render the shifting means inoperative as the hammering means approaches either side of the frame, said automatic means including stationary cams mounted on the frame. x 12. The combination of hammering means, a support for the same comprising a guide, means to move the hammering means along the guide comprising a shifting member carriedby the support and movable longitudinally'of the guide and a cooperating-member connected with the hammering means and adapted to engage or be disengaged from the. shifting member, means operable by the operator to control the engagement of said members, and automatic means to effect the disengagement of said members as the hammering means reaches a predetermined point in its movement across the frame.

13; In a power hammer, the combination of an anvil, a hammer head, means including a'belt for operating the hammer head up and down, means including an elongated means to constantly moving feeding member having portions moving in opposite directions and a clutch member movable into engagement with said feeding member for shifting the hammer head along the anvil in either di-' ing a belt to operate the hammerhead up and down, a movable tightening member coacting with said belt, means including a feeding device and a clutch member movable into engagement therewith for shifting the hammer head along the anvil, and controlling mechanism for said clutch member and said belt tightening member, including a pedal. a movable support upon which said pedal is tiltably mounted and means whereby the tilting of said pedal operates one of said members and the bodily movement thereof with said support operates the other member.

In testimony whereof, I have signed my name to this specification.

ALFRED E. HORMAN. 

